diff --git a/build/shared/dist/examples/Display/RowColumnScanning/RowColumnScanning.pde b/build/shared/dist/examples/Display/RowColumnScanning/RowColumnScanning.pde new file mode 100644 index 000000000..5d2f54e23 --- /dev/null +++ b/build/shared/dist/examples/Display/RowColumnScanning/RowColumnScanning.pde @@ -0,0 +1,114 @@ +/* + Row-Column Scanning an 8x8 LED matrix with X-Y input + + This example controls an 8x8 LED matrix using two analog inputs + + created 27 May 2009 + modified 29 Jun 2009 + by Tom Igoe + + This example works for the Lumex LDM-24488NI Matrix. See + http://sigma.octopart.com/140413/datasheet/Lumex-LDM-24488NI.pdf + for the pin connections + + For other LED cathode column matrixes, you should only need to change + the pin numbers in the row[] and column[] arrays + + rows are the anodes + cols are the cathodes + --------- + + Pin numbers: + Matrix: + * Digital pins 2 through 13, + * analog pins 2 through 5 used as digital 16 through 19 + Accelerometer: + * X and Y axes attached to analog in 0 and 1 + + http://www.arduino.cc/en/Tutorial/RowColumnScanning + + see http://www.tigoe.net/pcomp/code/category/arduinowiring/514 for more + */ + +// max and min values from the accelerometer, +// found by experiment: +const int sensorMin = 380; +const int sensorMax = 620; + +// 2-dimensional array of row pin numbers: +const int row[8] = { + 2,7,19,5,18,12,16 }; + +// 2-dimensional array of column pin numbers: +const int col[8] = { + 6,11,10,3,17,4,8,9 }; + +// 2-dimensional array of pixels: +int pixels[8][8]; + +// cursor position: +int x = 5; +int y = 5; + +void setup() { + Serial.begin(9600); + // initialize the I/O pins as outputs: + + // iterate over the pins: + for (int thisPin = 0; thisPin < 8; thisPin++) { + // initialize the output pins: + pinMode(col[thisPin], OUTPUT); + pinMode(row[thisPin], OUTPUT); + // take the col pins (i.e. the cathodes) high to ensure that + // the LEDS are off: + digitalWrite(col[thisPin], HIGH); + } + + // initialize the pixel matrix: + for (int x = 0; x < 8; x++) { + for (int y = 0; y < 8; y++) { + pixels[x][y] = HIGH; + } + } +} + +void loop() { + // read input: + readSensors(); + + // draw the screen: + refreshScreen(); +} + +void readSensors() { + // turn off the last position: + pixels[x][y] = HIGH; + // read the sensors for X and Y values: + x = 7 - map(analogRead(0), sensorMin, sensorMax, 0, 7); + y = map(analogRead(1), sensorMin, sensorMax, 0, 7); + pixels[x][y] = LOW; + +} + +void refreshScreen() { + // iterate over the rows (anodes): + for (int thisRow = 0; thisRow < 8; thisRow++) { + // take the row pin (anode) high: + digitalWrite(row[thisRow], HIGH); + // iterate over the cols (cathodes): + for (int thisCol = 0; thisCol < 8; thisCol++) { + // get the state of the current pixel; + int thisPixel = pixels[thisRow][thisCol]; + // when the row is HIGH and the col is LOW, + // the LED where they meet turns on: + digitalWrite(col[thisCol], thisPixel); + // turn the pixel off: + if (thisPixel == LOW) { + digitalWrite(col[thisCol], HIGH); + } + } + // take the row pin low to turn off the whole row: + digitalWrite(row[thisRow], LOW); + } +} +